Suspension composition



7 may be employed.

A E 5:1 TION ENEWJEBSEY so srou ooosmou mg; In as l g. t i.

This invention relates to a composition comprising a suspension of a water-msoluble metallic soap such as calcium steal-ate,

zinc stearate, aluminum palmitate and the a like and to the process of making such composition.

For certain purposes there is desired a means of mixing a water-insoluble metallic soap in materials which are moist as for in example in the waterproog of Portland cement. In this case 2 or tiger cent of for example calcium stearate used on the amount of neat cement employed is added to the cement or concrete material. Dificulty It arisesv in distributing the calcium stearate uniformly tough the composition owing to its Water-repellent character. Thus it may readily float about and collect in the material at points where a greater propor- 9 tion of water is present. In the present invention a composition is produced which contains the metallic soap in suspension in a cly divided, and possibly in some cases, slightly colloidal condition enabling a uniform distrihution through the moist material to which it is desired to he added. in

like manner the composition of the present invention may be applied to damp or wet surfaces without the dificulty which would, m he encountered through lack of uniformity of spreading when the dry metallic soap by itself is employed. A suspension made in accordance with the present invention is prepared by stating preferably by grinding in a ll mill the desired amount of the metallic soap with preferably a much smaller amount of a colloidal clay suhh as bentonite and a quantity of water suficient to make a paste or cream. The agitation and ding is maintained for-a time sufficient to yield a good suspension. The

temperature may he ordinary room temperature or hier or lower temperatures 'le water is the preferred suspending medium it should be understood that I do not preclude the addition of substances such'as glycerol, glue, gelatin, gum tragacanth end the like. Ordinarily however the tonite or other colhour or longer until a sion results.

Mention nee February as, was. serial No. 18,859.

may be drawn on and a soft paste or thick white creamy composition thus is obtained.

using less water a heavier bodied paste will result but I prefer'to employ slightly more water than the ultimate composition requires in order to secure a; more satisfactory grinding effect.

By varying the proportion of bentonite the amount of water, consistency of the sus pension and other properties may be varied.

Such a composition containing the zinc stearate may be employed for cosmetic purposes. Waxes and other substanccs,. emollients and the like may be incorporated.

For Waterproofin concrete calcium stearate is preferred an may be obtained in the form of an emulsion in like manner. For purposes of shipment the amount of water should he reduced to a minimum consistent with ease. of mixing. Hence the paste may be made up with a minimum amount of water or anexcess of. water used and some portion of it removed subsequently by settling, centrifuging, evaporation etc.

For use to incorporate with paper pulp in making a water resistant paper, press- 'board and the like I may prepare the composition in a similar manner and apply it to the paper pulpfor. example by spraying the suspension on to the pulp in the paper machine so that as thepaper is building up in'thickness each course or layer of the pulp receives a spraying of the calcium stearate or whichever metallic soap is employed. Or one or more layers of the paper, either those at the surface or interior ones may be treated in like manner. The exact procedure of course will depend upon thethickness of the being forme "aper or pressboard which is d as well as other conditions. I The employment of other waterproofing a nts such as waxes, asphalts, gilsonite,

pitches, resins, resin soaps such as calcium, or aluminum resinate in the foregoing com positionis not precluded. In some cases wa- I ter-insoluble metallic resinates may be used in lieu of the metallic soaps illustrated above.

' I do. not wish to limit myself to any particular metallic soap but -may use any of those which are appropriately water-resistant and mixturesof two or moresoaps may be employed if desired. Neither is the addition of water soluble soaps suc .as sodium or po tassium o'leate ior stearate precluded where such tion yields a product especially adapted for certain applications.

It shouldbe noted that-when water-insoluble metallic soaps in powdered form are stirred in water they repel the water and form a film of the powder on thesurface, and even though stirred for a long 'criod the metallic soap and water will not mix or. form any suspension. In the present case by inding the metallic soap in an aqueous, me ium, that is one containin water or consisting largely of water, in the resence' of a suspensory agent,

'illustratively 'bentonite, a sus ension of creamy to pasty consistency may e obtained in which the metallic soap is well distributed,

instead of separatinggfrom the water as a water-repellent film. y means of such a suspension it is possible therefore to distribute a metallic soap in an aqueous medium so that it may spread through a mass of material or over a" surface in a manner which would be 7 quite impossible were the metallic soap and cipitatenmay be washed to remove soluble and water and salts and water added to the wet mass without any intermediate d v 11g. This product is then ground as descrhed above for the purpose of securing a more perfect colloidal sus ension than that obtained with the dry pow ered melic soap. Also it is possible to eav out the precipitation as shove without ulent materials.

attritioncaplable of securing an adequate dispersion of t e wet metallic soap. I

' The invention also comprises ermeable or porous material such as paper, c oth, leather,

concrete and the like water roofed by disersedwater-insoluble metalic soa s such or example as compositionseprepare in accordance with the foregoing.

What I claim is:'--' V A 1. A suspension in an aqueous vehicle comprisin a water-insoluble soap and a colloidal clay o the bentonite type having the property of maintaining said water-insoluble soap in appropriate suspension. Y 2. The process of making a sus' n'sion of. a water-insoluble metallic soap, w ch comprises inding said soap in water in the presence o bentonite.

3. In an aqueous suspension comprising icollodial clay of the bentonite type, a water insoluble soap ordinarily repelling water and in the powdered form forming a m of pow der on the surface of the water even though a stirred for a long period, said water insoluble soa being ground in contact with the ben-;

tomte and water, whereby a dis ersion of creamy to pasty'consistency is o tained in which the metallic soap is well distributed and does not separate from the water as a waterrepellantfilma 4. A suspension in water containing a, water-insoluble metallic soap intimately incorporated with bentonite, both the soap and the bentonite existing, in said suspension, as finely pulverulent materials.

5. A suspension in water containing a wae ter-insoluble metallic soap intimately incorporated with bentonite, said soap being present in amount substantially greater than said I bentonite,both the soap and the bentonite ex- 5 isting, in said" suspension, as finely pulver- QARLETON Enn s.

the presence of bentonite and without drying the precipitate, incorporate with bentonite :1 or subject to any other.

appropriate vigrous mechanical agitation or 

